Pros and cons of installing ESXi on a SSD vs USB flash drive?

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I'm debating on doing an ESXi 4.1/5.0 installation on a USB stick or a pair of 32GB SATA II SSDs (RAID1 mirror). According to VMWare's documentation, when ESXi is booting it looks for a 4GB space for a scratch partition. Assuming the USB stick I use has adequate storage (say 16GB), is there any advantage to installing ESXi on an SSD or better yet, and SSD RAID1 mirror? Note: The documentation states that ESXi takes up 5.2GB of free space on disk; 5.2GB + 4GB = 9.2GB which is well below the 16GB for the USB stick.
I'd prefer to use the SSDs for something other than the ESXi installation. I thi
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Stories similar to Pros and cons of installing ESXi on a SSD vs USB flash drive?

VMware has recently released its new VM hypervisor product, VMware
ESXi 5.0. VMware is replacing its current ESX model with ESXi and the
biggest change (between ESX and ESXi) is the architecture, as most of
you VM gurus are well aware of, but for the people that don't know I
will quickly explain.

VMware has recently released its new VM hypervisor product, VMware
ESXi 5.0. VMware is replacing its current ESX model with ESXi and the
biggest change (between ESX and ESXi) is the architecture, as most of
you VM gurus are well aware of, but for the people that don't know I
will quickly explain.